<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>登录</title>
</head>
<body>

<form action="http://localhost:3000/login" method="post">
  
  邮箱：<input type="email" name="email"><br><br>
  密码：<input type="password" name="password"><br><br>
  <input type="submit">
  
</form>

<script type="text/javascript">
  
  let err = ''
  
  err = '邮箱输入不合法'
  
  
  
</script>

</body>
</html>